Lena Dunham has led the cast of Girls in a PSA dedicated to the Stanford University sexual assault survivor.

The powerful impact statement put forward by the victim of 20-year-old Brock Turner, who was given a six-month jail sentence for sexually assaulting an unconscious woman, has sparked support from all over the world.

There's also been outcry over the judge's decision to sentence Turner to six months in jail despite prosecutors' request for six years and a maximum penalty of 14 years.

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Joined by her co-stars Jemima Kirke, Allison Williams and Zosia Mamet, Dunham stressed the message that victims of sexual assault should be supported not because "she is someone's daughter, girlfriend or sister", but because "she is someone".

I dedicate this to the brave survivor in the Stanford case who has given so much to change the conversation. https://t.co/KMOJUxvPu0